Needing to Restart Intellij Idea for updated environment variables values

HI,
In my spring mvc project i am accessing an environment variable like ${FLOCK_APPS_CONFIG} .
But when i change it value in .bash_profile file the same is not reflected even if i do mvn clean etc.
It always picks up the old value.
Only when i do Invalidate Caches and Restart does it starts picking up the updated value.

Why is that ?
Is there any way to avoid this ?

Thanks